/*
 * [New BSD License]
 * Copyright (c) 2011-2012, Brackit Project Team <info@brackit.org>  
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Brackit Project Team nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.brackit.xquery.node.dom;

import java.util.ArrayDeque;
import java.util.Deque;

import org.brackit.xquery.node.parser.DefaultListener;
import org.brackit.xquery.node.parser.SubtreeListener;
import org.brackit.xquery.xdm.DocumentException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * @author Sebastian Baechle
 * 
 */
public class DOMListener extends
		DefaultListener<org.brackit.xquery.xdm.Node<?>> implements
		SubtreeListener<org.brackit.xquery.xdm.Node<?>> {
	protected DocumentImpl document;

	protected final Deque<NodeImpl> stack;

	public DOMListener() {
		this.stack = new ArrayDeque<NodeImpl>();
	}

	@Override
	public void startDocument() throws DocumentException {
		if (document != null) {
			throw new DocumentException("Multiple documents are not supported");
		}

		document = new DocumentImpl();
		stack.clear();
	}

	public Document getDocument() {
		return document;
	}

	@Override
	public <T extends org.brackit.xquery.xdm.Node<?>> void attribute(T node)
			throws DocumentException {
		Node current = stack.peekLast();
		((Element) current).setAttributeNode(new AttrImpl(document, current,
				node.getName().stringValue(), node.getValue().stringValue()));
	}

	@Override
	public <T extends org.brackit.xquery.xdm.Node<?>> void startElement(T node)
			throws DocumentException {
		NodeImpl current = stack.peekLast();

		ElementImpl newChild = new ElementImpl(document, current, node
				.getName().stringValue(), null);

		if (current != null) {
			((Element) current).appendChild(newChild);
		} else {
			document.setDocumentElement(newChild);
		}

		stack.addLast(newChild);
	}

	@Override
	public <T extends org.brackit.xquery.xdm.Node<?>> void endElement(T node)
			throws DocumentException {
		stack.pop();
	}

	@Override
	public <T extends org.brackit.xquery.xdm.Node<?>> void text(T node)
			throws DocumentException {
		insertText(node.getValue().stringValue());
	}

	@Override
	public <T extends org.brackit.xquery.xdm.Node<?>> void comment(T node)
			throws DocumentException {
		insertComment(node.getValue().stringValue());
	}

	@Override
	public <T extends org.brackit.xquery.xdm.Node<?>> void processingInstruction(
			T node) throws DocumentException {
		insertProcessingInstruction(node.getValue().stringValue());
	}

	private void insertText(String text) throws DocumentException {
		NodeImpl current = stack.peekLast();
		current.appendChild(new TextImpl(document, current, null, text));
	}

	private void insertProcessingInstruction(String value) {
		NodeImpl current = stack.peekLast();
		current.appendChild(new ProcInstrImpl(document, current, null, value));
	}

	private void insertComment(String value) {
		NodeImpl current = stack.peekLast();
		current.appendChild(new CommentImpl(document, current, null, value));
	}
}